Production of high-quality tone circuits

In low-end or high-end power amplifier systems, there are tone control circuits in addition to volume control. In order to save costs, some low-end machine manufacturers only use resistance-capacitance tones in their tone parts. Lack of strength and clarity, it sounds very muddy and messy, and it is disturbing to listen to for a long time. These machines are wasteful and wasteful, but they are not satisfactory for their use. Its operation (motor) is to produce a high-quality tone board to replace the tone part of the original machine. The following will introduce several excellent-quality tonal circuits to enthusiasts to choose from. Among them, LM4610N and LM1036N are the best. LM4610N is a new generation of fever products that add 3D sound field effect processing function on the basis of LM1036N. The author recommends LM4610N as the first choice.

Figure 1 is a high and middle bass tone and volume control circuit composed of two NE5532N (only one channel is drawn in the figure, the other channel is exactly the same), the principle is: the signal passes IC1 (for buffer amplification and isolation, to avoid load and The influence between the signal sources) into the three frequency equalization networks composed of resistors and capacitors, that is, the frequencies of treble, midrange, and bass. When adjusting the corresponding low, medium and high frequencies of RP1 ––– RP3, they will enter IC2 and its corresponding The inverting amplifier circuit composed of the feedback circuit, adjusting RP1 ––– RP3 is to enhance or attenuate the high and middle bass, thereby achieving the effect of audio adjustment. It should be noted that the NE5532N used must be an authentic product, such as the American S and Philips, so that the signal-to-noise ratio, dynamic range, transient response and control effect of the circuit can reach a very high level. (For a higher level, NE5532N can be replaced with NE5535N, OP275, AD827JN and other high-quality op amps, of course, the price is a little higher).

Figure 2 is the use of second-order RC active two-frequency circuit, the circuit is composed of two NE5532N (only one channel is drawn in the figure, the other channel is the same), in the figure IC1A and IC1B respectively form a low-pass and high-pass filter , To complete the audio signal division, and then sent to the high and low volume control potentiometer, respectively, and then enter the high and low power amplifier circuit to drive the tweeter and bass speaker. The disadvantage of using this circuit is to add a pair of power board circuits and an additional set of terminals. Relatively speaking, it takes more money, but the advantages of using pre-frequency division are very obvious: â‘ improved bass sound quality; â‘¡accompanied by the sound efficiency of the high and low speakers; â‘¢ solved the problem of connecting the high and low speakers in the circuit There is a problem of impedance mismatch; â‘£ The dynamic range of tone adjustment becomes significantly larger. This is why many audiophiles love playing electronic crossover amplifiers.

Figure 3 is a volume, tone, balance, equal-noise control circuit, the core of which is the use of National Semiconductor's high-quality tone circuit LM1036N, and is equipped with the US large S boutique op amp NE5532N for first-level amplification and broadening (T2 It works when short-circuited with NEH, and it has a good effect on the deck.) The LM1036N is a two-channel integrated circuit that uses DC level control tones (high and low), volume, and balance, and has equal loudness control. Its function is due to the presence of human ears. When the volume is low, the sensitivity to high and low frequency signals is reduced. Therefore, it is necessary to appropriately increase and compensate the high and low frequency signals at different volumes, so that the human ear can hear flat and balanced loudness at any loudness (7 of LM1036N in Figure 3). It works when the foot is connected with 12 feet). The advantage of using DC level control is that the adjustment of high and low bass does not affect each other. The potentiometer is used with ordinary products and connected with long wires without noise. The control is very smooth. The main performance of the LM1036N is as follows: the operating voltage is 9-18V (usually 12-15V), the signal-to-noise ratio is 90dB, the tone control range is 15dB, the volume control range is 80dB, and the distortion is only 0.03%. The LM1036N has excellent treble resolution and bass strength, and the sound quality is clear, natural and smooth. It is a fine product for the tone of the power amplifier. I believe that the majority of audiophiles have known it in many electronic publications!

Here to introduce to the enthusiasts a better tone circuit than the LM1036N-LM4610N, this integrated chip is a new product introduced by the National Semiconductor Corporation (NS company) that contains all the functions of the LM1036N, and also has stereo 3D surround Sound field effect processing function, when K2 is turned on, the 3D surround sound processing function is turned on. At this time, you can adjust the stereo three-dimensional (3D) sound field effect to the best according to your own preferences! The main performance parameters of the LM4610N are as follows: the operating voltage is 9-16V (typically 12V), the tone adjustment range is ± 15dB, the balance adjustment range is 1-20dB, the volume adjustment range is 75dB, the total harmonic distortion is only 0.03%, and the signal-to-noise ratio is 80dB , The frequency response is up to 250KHz. In addition to the excellent sound quality of the LM1036N, the LM4610N also has a 3D surround sound field effect processing function (switching on and adjusting the RP5 can get the favorite effect), and its three-dimensional sense of space is very strong (similar to the effect of SRS), Figure 4 It is the application circuit of LM4610N, and it is the first choice for replacing or assembling the tonal part of the power amplifier system.

As long as the components are intact and soldered correctly, the production of the above four tone circuits is not difficult. The key lies in the rational design of the printed circuit board and the use of high-quality fever components to develop their own characteristics. The above four tone circuits are not included in my design. Transformer power supply, because with a transformer will only increase the interference of electromagnetic waves on the sound quality, and rectification and filtering are even more superfluous. Is there no suitable power supply in the power amplifier? There is indeed no active servo power supply or parallel regulated power supply, and its effect can be brought to the highest level! The author's component selection: ① Japanese high-quality capacitors are used for coupling capacitors; ② Inductive capacitors use Japanese music CBB metalized non-inductive capacitors; ③ All resistors use low-noise and high-precision five-color ring metal film resistors; ④ Circuit boards use epoxy plates, (It is better to make a layer of tin plating in amateur production. The silver plating process can be used for mass production. The effect is better); ⑤ Because the LM4610N is newly launched in the Chinese market, it is more difficult to buy and can be obtained by mail order.

Replacing the tone part of the power amplifier depends on different machines, there are different solutions, I believe that friends who have hands-on ability will certainly, here only recommend a solution for how to assemble the power amplifier: audio source (such as CD, VCD machine, etc.) → sound effect processing circuit (Such as 62415, BBE, 3D, etc.) → tone circuit (such as the four circuits in this article) → pre-amplifier (you can not, if you need to adjust the magnification reasonably) → power amplifier circuit (such as TDA1514A, LM4766, LM1875T, LM3886TF, TDA7294, etc.) → Speaker protection, transformers and power supply parts are also required. When assembling, pay attention to a little grounding method, and strive to minimize noise.


The world premiere of the technical zone! ROHM has developed the power supply IC "BD372xx series" for high-quality audio. A practical guide for the purchase of home wireless routers. Understanding the circuit diagram and working principle of the audio. Talking about the "frequency response curve" in the audio. Deep dismantling report of the M0pro speaker: both internal and external

Follow WeChat

Interesting and informative information and technical dry goods

Download Audiophile APP

Create your own personal electronic circle

Follow the audiophile class

Lock the latest course activities and technical live broadcast
Collect People collection
share it:
comment
Publish

related suggestion

var check_allow = "/d/Api/iscantalk.html"; var add_url = '/ d / article / write /'; function CheckLogin () {now_uid = ''; var ElecfansApi_checklogin = '/ webapi / passport / checklogin'; var logout_url = "{: U ('Login / logout')}"; var logout_url = 'http://bbs.elecfans.com/member.php?mod=logging&action=logout&refer=front'; $ .get (ElecfansApi_checklogin, function (data, textStatus) {if (data! = "") {EchoLoginInfo (data); CheckEmailInfo (data); data = $ .parseJSON (data); now_uid = data.uid; / * var login_content = 'write an article
'+ data.username +'
Quit '; * / var login_content =' write an article
'+ data.username +'
Set exit '; $ (' # login_area '). Html (login_content); var win_width = $ (window) .width (); if (win_width> 1000) {$ ("# mine"). MouseDelay (200) .hover (function () {$ ("# mymenu"). show ();}, function () {$ ("# mymenu"). hide ();});}} else {var content = 'Login Registration'; $ ('# login_area'). html (content); $ (". special-login"). click (function (e) {$ .tActivityLogin (); return false;});}});} $ (function () {// comment ------------------------------- var comment = $ ("# comment"); var comment_input = $ ("# comContent"); // Submit comment click event interaction $ ("# comSubmit2"). on ('click', function () {var content = comment_input.text (); // Empty input box comment_input. html (""). focus (); // Submit data to the server $ .ajax ({url: '/plus/arcComment.php', data: {aid: $ ("# webID"). val (), dopost : 'apiPubComment', content: content}, type: 'post', dataType: 'json', success: function (data) {// Data format returned: if (data.status == "successed") {// Build temporary comment DOM var dom = ''; dom + = '
'; dom + =' '; dom + ='
'; dom + ='

'+ data.data.username +' '; dom + ='

'; dom + =' '+ content +' '; dom + =' '; dom + =' just now '; dom + =' '; dom + =' '; // insert a temporary comment to the list $ ("# comment ") .append (dom);} if (data.status ==" failed ") {// alert (data.msg); layer.msg (data.msg);}}}); return false;}); (function () {/ * * Insert single sign-on JS * / var setHost = 'https://passport.elecfans.com'; // Set domain name var script = document.createElement ('script'); script.type = 'text / javascript'; script.src = setHost + '/public/pc/js/t.passport.js'; script.setAttribute ("id", "sso_script"); script.setAttribute ("data-ssoSite", setHost); script.setAttribute ("data-ssoReferer", encodeURIComponent (location.href)); script.setAttribute ("data-ssoSiteid", "11"); var body = document.getElementsByTagName ("body"). item ( 0); body.appendChild (script);}) () / * * It is recommended to modify the style of the article without a picture * * / $ (". Article .thumb"). Each (function () {if ($ (this). find ('img'). attr ('src') == "") {$ (this) .find ('img'). remove (); $ (this) .parent (). css ('padding-left ',' 0px ');}}); / * Baidu share * / window._bd_share_config = {common: {bdText: '', // Custom share content bdDesc: '', // Custom share summary bdUrl: window.location.href, // Custom share URL address bdPic: ''} , share: [{"bdSize": 60, "bdCustomStyle": true}]} with (document) 0 [(getElementsByTagName ('head') [0] || body) .appendChild (createElement ('script')). src = 'http://bdimg.share.baidu.com/static/api/js/share.js?cdnversion=' + ~ (-new Date () / 36e5)]; var add_url = '/ d / article / write / '; // var check_allow = "{: U (' Api / iscantalk ')}"; var check_allow = "/ d / api / iscantalk"; var click_items_length = $ ('. art_click_count '). length; if ( click_items_length> 0) {var id_str = ''; $ ('. art_click_count'). each (function () {id_str + = $ (this) .attr ('data-id') + ',';}) // var url = "{: U ('Api / getclickbyids')}"; var url = "/ d / api / getclickbyids"; var id_data = 'id_str =' + id_str; $ .ajax ({url: url, data: id_data, type: 'post', dataType: 'json', success: function (re) {if (re.list.length> = 1) {var list = re.list; for (var i in list) {var t emp_id = list [i] ['id']; var temp_span = $ (". art_click_count [data-id =" + temp_id + "]") temp_span.html (list [i] ['click']);}} }})} $ ("# comContent"). click (function () {if (now_uid == '') {$ .tActivityLogin (); return false;}}) $ (function () {var follow_wrap = $ ( ".author-collect"); var now_uid = "{$ _super ['uid']}"; var face_src = "{$ _super ['uface']}"; var getFollowNum = $ (". followNum strong"). html (); // Follow $ (window) .on ('click', '.author-collect', function () {if (now_uid == '') {$ .tActivityLogin (); return false;} if ( $ (this) .attr ('id') == 'follow') {$ .post ('/ d / user / follow', {tuid: article_user_id}, function (data) {// Data format returned: if (data.status == "successed") {$ (". followNum strong"). html (++ getFollowNum); follow_wrap.html ('followed'). attr ('id', 'cancelFollow'). css ( 'background', '# 999'); var follow_user = ' '; $ (' # follow_list '). append (follow_user);} if (data.status == "failed") {alert (data.msg);}});} else {// Unfollow if ($ ( this) .attr ('id') == 'cancelFollow') {$ .post ('/ d / user / cancelFollow', {tuid: article_user_id}, function (data) {// Data format returned: if (data .status == "successed") {follow_wrap.html ('Follow'). attr ('id', 'follow'). css ('background', '# f90'); $ (". followNum strong"). html (-getFollowNum); $ ('# follow_list .face'). each (function () {var target_uid = $ (this) .attr ('data-uid'); if (target_uid == now_uid) {$ ( this) .remove ();}})} if (data.status == "failed") {alert (data.msg);}}); return false;}}});});}); / * var myface = "{$ _super ['uid'] | avatar}"; var myname = "{$ _super ['username']}"; var article_id = {$ article ['id']}; var article_user_id = {$ article ['mid']}; // Article author ID $ (function () {<notempty name = "clearnum"> // Reduce the number of reminders var count = parseInt ($ ("# noticeCount"). html ()); count = count-{$ clearnum}; $ ("# noticeCount"). html (count); if ( count

Brushed Dc Motor Controller

Brushed Dc Controller,Brushed Motor Controller,Brushed Motor Speed Control,Brushed Dc Motor Controller

Jinan Keya Electron Science And Technology Co., Ltd. , https://www.keyaservo.com